Update random_compat to master.

Clarifies strings, Merges [35587] upstream.
See #34409, #28633


git-svn-id: https://develop.svn.wordpress.org/trunk@35600 602fd350-edb4-49c9-b593-d223f7449a82

src/wp-includes/random_compat/random_bytes_dev_urandom.php

@@ -132,6 +132,6 @@ function random_bytes($bytes)
      * If we reach here, PHP has failed us.
      */
     throw new Exception(
-        'PHP failed to generate random data.'
+        'Error reading from source device'
     );
 }